Critical mass Student activity Play

Critical mass Whiteboard exercise Play

Double circulatory system in mammals Animation Play

Double cone and a plane Animation Play

Double fertilization Whiteboard exercise Play

Double helix Animation Play

'Double quadratic' equations Student activity Play

'Double quadratic' equations Whiteboard exercise Play

Double-angle formulas Class activity Play

Double-angle formulas Whiteboard presentation Play

Electrophilic addition of hydrogen halides to double bond Whiteboard exercise Play

Electrophilic addition of hydrogen halides to double bond Student activity Play

Estimation of the volume Animation Play

Examples of 3-D shapes Animation Play

Examples of 3-D shapes Student activity Play

Eye structure Slideshow Play

Finding the volume of a cone Animation Play

Finding the volume of a frustum of a cone Whiteboard exercise Play

Fish – jawless; cartilaginous and bony Student activity Play

Frustum of a cone Student activity Play

Frustum of a cone as a solid of revolution Animation Play

Geometrical approach to the parabola Student activity Play

Gymnosperms Student activity Play

Gymnosperms – seed plants with sporophyte and gametophyte generations Student activity Play

Human eye – anatomy Student activity Play